Anyways my computer is dusty and i havent cleaned it in like 2 months
Huh? I imagine most go longer than that between cleaning, so I'm not sure how that is related.
You even said that thermals were fine. If the cooler had sediment blockage, which is a separate issue, it wouldn't be.
-The pump is in that black cube.
-Air is no good to the pump. The fluid is what keeps them lubricated and cool.
-AIO/CLCs are not topped off with fluid, so there is air present from the get-go. Fluid volume slowly decreases over time.
-Air makes its way to the highest point of the loop. Some may get stuck elsewhere during a reinstall or being removed from its packaging, after which it just needs a 'helping hand'.
There are 3 different pump locations among AIOs, and they affect your radiator mounting options:
-cpu/gpu block
-radiator
-tubing/hoses
The MAG Coreliquid is number 2. Radiator options: front only, really. Ignore the top mounted marketing images.